100 lines
3.6 KiB
C#
100 lines
3.6 KiB
C#
using System;
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using System.IO;
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using System.Net;
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using System.Text;
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namespace AppLimit.CloudComputing.SharpBox.Common.Net.Web
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{
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internal class WebRequestMultipartFormDataSupport
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{
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private const string FormBoundary = "-----------------------------28947758029299";
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public string GetMultipartFormContentType()
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{
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return string.Format("multipart/form-data; boundary={0}", FormBoundary);
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}
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public long GetHeaderFooterSize(string fileName)
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{
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var header = GetHeaderData(fileName);
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var footer = GetFooterString();
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return header.Length + footer.Length;
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}
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/// <summary>
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/// This method prepares a webrequest to be a multpart data requets
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/// </summary>
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/// <param name="request"></param>
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public void PrepareWebRequest(WebRequest request)
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{
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request.Method = "POST";
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request.ContentType = GetMultipartFormContentType();
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}
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/// <summary>
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/// This method opens a network file data stream which means the http(s)
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/// will be established to the server
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/// </summary>
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/// <param name="requestStream"></param>
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/// <param name="fileName"></param>
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/// <returns></returns>
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public void PrepareRequestStream(Stream requestStream, string fileName)
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{
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// Add just the first part of this param, since we will write the file data directly to the Stream
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var header = GetHeaderData(fileName);
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// write the header into stream
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requestStream.Write(header, 0, header.Length);
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}
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/// <summary>
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/// This method writes the footer into the data stream
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/// </summary>
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/// <param name="networkStream"></param>
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public void FinalizeNetworkFileDataStream(Stream networkStream)
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{
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var encoding = Encoding.UTF8;
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var footer = GetFooterString();
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networkStream.Write(encoding.GetBytes(footer), 0, footer.Length);
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}
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/// <summary>
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/// Check if the current request us a multipart upload file
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/// </summary>
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/// <param name="request"></param>
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/// <returns></returns>
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public bool IsRequestMultiPartUpload(WebRequest request)
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{
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try
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{
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if (request.ContentType == null)
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return false;
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if (request.ContentType.Equals(GetMultipartFormContentType()))
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return true;
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return false;
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}
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catch (NotSupportedException)
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{
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return false;
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}
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}
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private static byte[] GetHeaderData(string fileName)
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{
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var utf8 = new UTF8Encoding();
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var data = utf8.GetBytes(string.Format("--{0}{4}Content-Disposition: form-data; name=\"{2}\"; filename=\"{1}\";{4}Content-Type: {3}{4}{4}",
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FormBoundary,
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fileName,
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"file",
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"application/octet-stream",
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Environment.NewLine));
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return data;
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}
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private static string GetFooterString()
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{
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return string.Format("{1}--{0}--{1}", FormBoundary, Environment.NewLine);
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}
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}
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} |